Given :
Cynthia makes apple pies and sells them.
Cost of ingredients, c = %1.50.
Selling price, S = $5.00.
To find her profits, she writes the expression $5.00x - $1.50x. Explain what the variable x represents.
Solution :
Let, total number of pies sell is x.
Profit in each pie is :

So, profit in x pies is ,

Therefore, x in given equation represents number of pies sold.
Hence, this is the required solution.